Overedge or overlock sewing-machine.



R. LOEB.

OVEREDGE 0R OVERLOCK SEWING MACHINE.

APPLICATION FILED MAR-25.1915.

1 ,%62,@?Q Patented Apr. 9, 1918.

4 SHEETSSHEET l- R. LOEB.

OVEREDGE 0R OVERLOCK SEWING MACHINE.

APPLICATION FILED MAR. 25. I915 Patented Apr. 9, 1918.

4 vSHEETS-SHEET 2.

. R. LOEB.

OVEREDGE OR OVERLOCK SEWING MACHINE.

APPLICATION FILED MAR.25. 1915.

v 1,26Q,@70 V PatentedApr. 9,1918.

4 SHEET$SHE 3- R. LOEB.

OVEREDGE 0R OVERLOCK SEWING MACHINE. APPLICATION FILED MAR. 25. I915.

Patented Apr. 9,1918.

4 SHEETS-SHEET 4.

'ITF; sirarns arena ai men.

RUDOLF LOEB, 0F JENKINTGWN, PENNSYLVANIA.

OVEBEDGE'OR OVERLOCK SEWING-MACHINE.

Specification of Letters Patent.

Application filed March 25. 1915. Serial No. 16,899.

the object of my invention is to provide a machine of the generalcharacter such as illustrated in the patent of 'Willcox and Berton, No.472,095, with means whereby the overlook or overedge stitches producedby such machine may be graduated or varied in length to effect theformation of a sealloped edge ornamentation for the fabric. In suchscalloped edge ornamentation, the shorter stitches will be slightlyraised or stuffed due to the infolding or turning of portions of. thefabric inclosed thereby.

These and other features of my invention are more fully describedhereinafter, refer ence being-had to the accompanying drawings, inwhich:

Figure 1, is a plan view of a machine embodying the improvements formingthe subject of my invention;

Fig. 2, is a side elevation of the same;

Fig. 3, is a front elevation;

Figs. 4c and 5, are sectional views of details of my invention;

Fig. 6, is a perspective view illustrating the particular character ofstitch regulating means constituting the subject of my invention;

Figs. 7, 8, 9, 10, 11 and 12, are perspective views showing the mannerin which the stitches of varying length are formed, and

Figs. 13 and let, are sectional views of the fabric at different pointsof the edge of the same, showing the stitches applied thereto.

The whole purpose and function of my invention is to apply stitcheswhich vary in length, and in the particular embodiment of my inventionas illustrated, these stitches gradually increase in length until themaximum length is reached, and then gradually decrease in length untilthe minimum length is reached; the Whole being carried on automaticallyand continuously whereby a sealloped edge is formed of what may betermed overlook or overeclge stitches.

The operation of this machine, in general, is similar to the patentbefore referred to,

and the manner of manipulating the particular portions constituting myimprovements is as follows:

In the operation of laying the short and long stitches in the formationof the improved embroidery edging, I provide a m0vable wedge-shapedmember 1 over which the stitches are formed, which member is moved atregular intervals with relation to the point at which the stitches arelaid, with the result that short stitches will be formed over the pointof the member when moved in one direction; such stitches graduallylengthening to the full sized stitches formed over the main body or heelof such stitch member and gradually shortening as the stitch member ismoved in the oppositedirection.

The tapering or pointed member 1 over which the stitches are formed isreciprocated back and forth with respect to the point at which thestitches are laid, and movement of this member may be effected by alever 2 having a cam groove 3 in which a roller i is verticallyreciprocated;such roller being actuated from a suitable part of themachine in a manner hereinafter described.

In the formation of the short and long stitches, it is, of course,necessary to alter at regular intervals the amount of thread fed to thestitch-forming elements, and hence I provide special tension means forthe several threads; the operation of such tension means coordinatingwith the movements of the stitch forming element, so that whileufficient thread will be pro 'ided, for the several stitches the tensionon the same will be increased for the shorter stitches. This tension maybe controlled by a second lever 2 actuated by similar means and movingin consonance with the lever 2 actuating the member 1 over which thestitches are formed.

lhe machine to which my improvements have been applied is provided withthe usual needle 5 of a character substantially similar to thatdisclosed in the patent before referred to, which needle cooperates witha hook 6 also substantially like that hown in the patent referred to,and operated in a similar manner. To the needle and hook respectively,threads 7 and 8 are led from suitable cops or spools, and when the ma-.

chine is once started, stitching will be carried on continuously; thefabric being sheared ahead ofthe stitching in the manner common PatentedApr. 9, 15918.

to the operation of machines of this character.

During this stitching, however, the stitch forming member 1 isreciprocated, so that short and long stitches may be laid over the sameand simultaneously with such movement of the stitch-forming member,tension is applied to and released from the hook thread, in order that agreater tension will be imparted thereto when the shorter stitches arebeing laid in order that they may be drawn close against the edges ofthe fabric: thereby folding portions of the same, and effecting thedesired scallop formation.

The stitch forming member 1 is carried by a lever 2; being mounted upona pin 9 slidable with respect to the foot 10. of the machine. The pin 9has secured to its rear end a clamp 9 which lies in the lower slottedend of the lever 2 and has a portion bearing against said lever. Thisclamp arrics a roller 9 which is adapted to rise and fall in grooves 9forr led in the lever 2, so that while said lever has a rockingmovement, a. horizontal reciprocative movement will be imparted therebyto the stitch forming member 1. This lever 2 is pivotally hung on aspindle 11 whereby it may rock or swing; such spindle being supported bya suitable standard 12, and oppositely disposed with respect to thislever 2, is a second lever 2 of the bell crank type, having an arm 13operatively connected to a spring-pressed post 14: which controlstension disks 15 for the hook thread 8.

The inner faces of the respective levers 2 and 2 are provided with camgrooves 3 and 3 which may be formed by ribs 16 set at an angle withrespect to said levers, and

rollers or pins 4 and 1 areadapted to these grooves, which rollers orpins are carried by a vertically sliding support- 17, so that movementof the latter will rock the levers 2 and 2 on their pivotal connectionwith the spindle 11 and effect proper movement of the member 1 overwhich the stitches are formed on the one hand, and increase the tensionon the thread 8 on the other hand. In addition, I provide an arm 18 withtension plates 19 tl'irough which the thread is guided.

The ribs 16are formed on plates 20 and 20 pivotally secured to thelevers 2 and 2" by screws 21 and 21, and these plates are adjustable onsaid levers; having pins 22 and 22 adapted to arcuate slots 23 and 23"in said levers 2 and 2 The position of the plates 20 and 20? may beregulated by means of set screws 2 carried by the'levers 2 and 2 andbearing against the pins 22 and 22; the position of said cam groovesdetermining the extent of movement of the levers 2 and 2 This adjustmentis relatively delicate.

The vertically, moving member 17 is guided in a suitable block 2 lcarried on the spindle 11 and motion is imparted in the following mannerOn the main driving shaft of the ma chine I provide a worm 25 meshingwith a worm wheel 26 on a shaft 27 carrying an adapted to said cam slotis a roller. 36 car-.

ried by the lower forked end 37 of a stem 38 which carries at its upperend an arm 39 connected to and operating the vertically sliding member17. By preference the forked end 37 is separate from the stem 38 andconnected thereto by a screw 10 in order that the parts of the mechanismmay be taken down without the necessity of dismantling the upper portionof the structure.

The movement of the stitch forming member 1 may be regulated to efiectchanges in the length of the scallops by changing the relation of theworm and worm wheel; a greater number of teeth in the worm wheelincreasing the length of the scallop and vice versa. Variation in thecharacter of the, scallop may be effected by altering the shape of thecam slot 35 which has a definite throw with reference to the size of theeccentric. A different sized eccentric would be combined with a pitmanhavinga greater throw and th cam slot 35 would be lengthened; resultingin the lengthening of the scallop. The same result might be attained byincreasing the angle of the cam slot and reducing the speed of thepitman by efl'ectingnecessary changes in the gearing.

Variations in the character of the slotmay be made to alter thecharacter of the scallop. If portions of the cam slot were horizontallydisposed, the stitch forming member would be caused to dwell in oneposition until a number of stitches were formed and this dwell might bearranged to occur at the high portion of this member r at the point-ofthe same. 7

The position of the plates 20 and 20 having the ribs 16 forming the camgrooves 3 and 3 is also a factor in determining the length of thescallops.

The movement of the stitch forming mechanism is readily regulabletherefor and while it takes place during the operation of the stitchlaying mechanism, its timing. and actual movement has no connection withthe speed of such stitch laying mechanism. The gearing, of course, isdriven from the main driving shaft of the machine.

' I claim:

and

'1. In an overedge or overlook sewing mamechanism, of a reciprocatingmember over which the stitches are formed, said member being tapered andserving to effect the formation of stitches of varying length atdifferent points around the same, tension means for the thread passingover said reciprocating member, and means for eflecting movement of saidreciprocating member coordinately with the action'of said tension means;the tension on the thread being inversely proportional to the size ofthe stitch formed over the tapering member.

2. In an overedge or overlook sewing machine, the combination withstitch forming mechanism including a plurality of elements for laying aplurality of threads to form interconnected stitches, of a reciprocatingmember over which the stitches are formed,- said member being shaped toeffect the formation of stitches of varying length at differentpointsthroughout its length, tension means for the thread passing over saidreciprocating means, and means for moving said reciprocating membercoordinately with the action of said tension means; the tension on thethread being inversely proportional to the size of the stitch formedover the tapering member.

8. In an overedge or overlook sewing machine, the combination withstitch forming mechanism, of a reciprocating member over which thestitches are formed, tension means for the thread passing over saidreciprocating member, said member serving to effect the formation ofstitches of varying length, means for causing said tension device toexert greater pull upon the thread when the shorter stitches are beingformed, and means for operating said reciprocating membercoordinatelywith the actuation of said tension device.

4. In an overedge or overlook sewingmachine, the combination with stitchforming mechanism, of a reciprocating member over which the stitches areformed,said member being tapered, tension means for the thread passingover said reciprocating member, said member serving to effect theformation of stitches of varying length in regular gradation, means forcausing said tension device to exert greater pull upon the thread whenthe shorter stitches are being formed, and means for operating saidreciprocating member coordinately with the actuation of said tensiondevice. 7

5. In an overedge or overlook sewing machine, the combination withstitch forming mechanism, of a reciprocating member over which thestitches are formed, tension means for the thread passing over saidrecipr0cating member, the latter serving to effect the formation ofstitches of varying length, a pair of levers, one of said leverscontrolling the tension device and the other lever carrying thereciprocating member, a pivotal connection for said levers, and meansfor rocking sald levers on their pivotal connection.

6. In an overedge or overlook sewing machine,-the combinationwith'stitch formingmechanism, of a reciprocating member over which thestitches are formed, said member being tapered, tension means for thethread passingover said reciprocating member, the latter serving toeffect the formation of stitches of varying length in regular gradation,a pair'of levers, one of said levers controlling the [tension device andthe other lever carrying the reciprocating member, a pivotal connectionfor said levers, and means for rocking said levers on their pivotalconnection.

7. In an overedge or overlook sewing machine, the combination withstitch forming mechanism, of a tapered reciprocating mem her over whichthe stitches are formed, the point of formation of a stitch upon suchmember regulating the size of the same, a lever carrying said member andhaving a cam groove, vertically movable means in engagement with'saidcam groove for rocking the lever upon its pivot and efi'ecting movementof the reciprocating member, tension means for the thread passing oversaid reciprocating member, and means for actuating said tension meanscoordinately with the movement of the tapering reciprocating member; thetension on the thread being inversely proportional to the size of thestitch formed over the tapering'member.

8. In an overedge or overlook sewing machine, the combination withstitch forming mechanism, of a reciprocating member over which thestitches are formed, a lever carrying said member, camming means carriedsai meIn er Y ric 1 a ea is by d b 6 t ally nov ble m r in engagementwith said caming means for rocking the lever upon its pivot andeffecting movementof the reciprocating member, a second lever operatedby the same means, and a tension device under the control of aid secondlever.

9. In an overedge or overlook sewing machine, the oombination with aplurality of stitch forming elements and a plurality of threads laidthereby, of a reciprocating member over which the stitches are formed, alever carrying said member, camming means carried by said member,vertically movable means in engagement with said camming means forrocking the lever upon its pivot and efiecting movement of thereciprocating member, a second lever operated by the same means, and atension device under the control of said second lever.

with said cam'gr'oove for rocking the lever upon its pivot and effectingmovement of ral'ity of threads, of a-tapered reciprocating member overwhich the-stitches are formed, a lever carrying said member and having acam groove, vertically movable means in engagement with said cam groovefor rocking the lever upon its pivotand effecting movement ofthereciprocating member, a second lever operated by said vertically movablemeans, a tension device under the control of said second lever, ahorizontally movable member having a cam groove, an operative connectionbetween the same and the vertically moving lever operating'member,gearing, and an eccentric and pitman connection between said gearing andthe horizontally movable member. V

'12. In an overedge or overlook sewing machine, the combination withstitch forming mechanism, of areciprocating member over which thestitches are formed, a lever carrying said member and having a camgroove, a stem upon which said leveris pivoted, a second lever mountedupon the same axis as the first and also having a camgroove, atensiondevice under the control of said second lever, vertically movablemeans in engagement with said cam grooves for rocking the levers upontheir pivots and eflecting move ment: of the reciprocating member andthe tensiondevice, and means for actuating'said vertically movablemeans. v

13. In an overedge 0r overlook sewing machine, the combination withstitch forming mechanism, of a reciprocatingmember over whichthestitches are formed, alever carrying said member and having a camgroove, a stem upon which said lever is pivoted, a second lever mountedupon the same aXis as the first and also having a cam groove, a tensiondevice under the control of said coples of this patent may be obtainedfor five cents each, by addressing the Commissioner of Patents.

able member, a pitmanconnected thereto, an;

eccentric, gearing for driving said eccentric V and vpitman, and a camgroove formed in the horizontally movable member for 00- action with apin carried by the vertically movable member. 1

14. In an overedge or overlocksewing ma chine, thecombination withstitch forming mechanism, of a tapered reciprocating momher over whichthe stitches are forniech a lever carrying said member and having camgroove, vertically movable 7 means in engagement with said cam groovefor rocking the lever upon its pivot and efiecting movement of thereciprocating member, and means for adjusting the position ofsuch camgroove. V

15. In an over-edge or overlook sewing ma chine, the combination withstitch forming mechanism, of a reciprocating member over which thestitches are formed, a lever car-- rying said member and having a camgroove, means adapted tosaidcam groove for rock ing the. lever, andmeans for adjusting the cam groove.

16. In an overedge or overlook sewing chine, the combination with stitchforming mechanism, of a reciprocating member over which the stitches areformed, a lever carrying said member, a platepivotally mounted on saidleverand having a cam groove,

means adapted tosaid cam groove for rocking'the lever, and means foradjusting said plate to regulate the extent of movement of the lever.

r 17. In an overlook RUDOLF LOEB.

Washington, D. 0.

g or ovei'edge sewing machine, the combinationwith stitch form ng

